iOS 3.1 I need help... Please!

My device is a 3g 32gb ipod touch with 3.1.3 firmware. i need THE EXACT STEPS to jailbreak my ipod, even if it means downgrading. if this is impossible, sorry for making a new thread. But if it is impossible FOR NOW then i need to know how to do it in the future. Thank you!

EDIT sorry i forgot to mention it is an MC model! if that makes a difference.

If you were jailbroken before and had used Cydia or Rock to back up the SHSH signature files, then you can downgrade using the steps above. If you weren't... sorry, no downgrading. Also, I suggest reading the stickied topics in the Jailbreak 3.1.3 forums, since they answer ALL of the questions you asked here.